#ifndef _LINUX_HDREG_H
#define _LINUX_HDREG_H

/*
 * This file contains some defines for the AT-hd-controller.
 * Various sources. Check out some definitions (see comments with
 * a ques).
 */

/* Hd controller regs. Ref: IBM AT Bios-listing */
#define HD_DATA      0x1f0     /* _CTL when writing */
#define HD_ERROR     0x1f1     /* see err-bits */
#define HD_NSECTOR   0x1f2     /* nr of sectors to read/write */
#define HD_SECTOR    0x1f3     /* starting sector */
#define HD_LCYL      0x1f4     /* starting cylinder */
#define HD_HCYL      0x1f5     /* high byte of starting cyl */
#define HD_CURRENT   0x1f6     /* 101dhhhh , d=drive, hhhh=head */
#define HD_STATUS    0x1f7     /* see status-bits */
#define HD_PRECOMP   HD_ERROR  /* same io address, read=error, write=precomp */
#define HD_COMMAND   HD_STATUS /* same io address, read=status, write=cmd */

#define HD_CMD       0x3f6

/* Bits of HD_STATUS */
#define ERR_STAT     0x01
#define INDEX_STAT   0x02
#define ECC_STAT     0x04 /* Corrected error */
#define DRQ_STAT     0x08
#define SEEK_STAT    0x10
#define WRERR_STAT   0x20
#define READY_STAT   0x40
#define BUSY_STAT    0x80

/* Values for HD_COMMAND */
#define WIN_RESTORE  0x10
#define WIN_READ     0x20
#define WIN_WRITE    0x30
#define WIN_VERIFY   0x40
#define WIN_FORMAT   0x50
#define WIN_INIT     0x60
#define WIN_SEEK     0x70
#define WIN_DIAGNOSE 0x90
#define WIN_SPECIFY  0x91

/* Bits for HD_ERROR */
#define MARK_ERR     0x01 /* Bad address mark */
#define TRK0_ERR     0x02 /* couldn't find track 0 */
#define ABRT_ERR     0x04 /* Command aborted */
#define ID_ERR       0x10 /* ID field not found */
#define ECC_ERR      0x40 /* Uncorrectable ECC error */
#define BBD_ERR      0x80 /* block marked bad */

/* HDIO_GETGEO is the preferred choice - HDIO_REQ will be removed at some
   later date */
#define HDIO_REQ     0x301
#define HDIO_GETGEO  0x301
struct hd_geometry {
    unsigned char heads;
    unsigned char sectors;
    unsigned short cylinders;
    unsigned long start;
};
#endif
